Reduction of emissions with cow urine as a catalyst in SCR system using response surface methodology

Nitrogen oxides are the most dangerous contaminants to human health and the atmosphere. The goal of this research work is to establish a feasible and promising approach for reducing NOx emissions from the exhaust pollutants of a diesel engine without any addition in fuel and impact onother pollutant emissions with cow urine as a catalyst. The experiments were conducted using a modified selective catalytic reduction application mounted on a single-cylinder diesel engine for water-based diesel exhaust with concentrations of 250, 500 and 750 ml at speeds of 800, 1600, and 2400 rpm for each sample. The response parameters such as NOx, CO, HC, CO2, smoke capacity, specific fuel consumption, and brake thermal efficiency were predicted employing the response surface method. Consequently, the maximum reduction of NOx was found to be 73.67% for cow urine having a concentration of 750 ml with 250 ml water tested under the speed of 800 rpm.